Process for obtaining photographic prints in natural colors from lumiere, autochrome, and other color-sensitive lined plates.



M. F. UNGERER. PROCESS FOR OBTAINING PHOTOGRAPHIG PRINTS IN NATURAL COLORS FROM LUMIERE,

AUTOOHROME, AND OTHER COLOR SENSITIVE LINED PLATES.

I APPLIOATION FILED AUG. 15, 1 913.

1,128,389., Patented Feb. 16, 1915. A.

fig]. v Z273.

ATTQ.

UNITED. sures FATE 114 F-P31 3 EBE 0F F NBA N-THE-MAIN GERMA Y- PROCESS FOR OBTAINING PHOTOGRAPHIC PRINTS IN IH L'J.'fl'li glib COLORS FROM LUMIERE, AUTOCH ROME, AND OTHER COLOR-SENSITIVE LINED PLATES.

a To all whom it may concern gelatin films; but this operation is difi'icult and takes up a great deal of time, while frequently the result is entire failure. It'is, however, so far as I am aware, quite new to obtain the three part negatives direct from color-sensitive lined plates in the manner hereinafter described, and to copy them one after the other on one and the same surface, thus ,gettin three separate colored part pic tures one a ove the other, on the same sur-' face, the finished picture giving the colors of the original.

Under the present invention the process consists essentially in making three part negatives from Lumiere, autochrome or sunilar color sensitive lined plateswhieh are diapesi i e n the P o r s n of th ar h ua th ee u rehti t Q9 fi e s e n mp py the c py b i g h e-by e tt on panchromatic plates. The three part negatives so obtained are extremely delicate and full in detail, and if printed from on paper or other suitable material hereinafter described prints will be obtained that reproduce exactly the colors of the original. The

literature of the subject contains nothingabout such process. For the preparation of three, color photographs, three separate part negatives, made in cameras and the like, are spoken of in all cases. So far as is known, it is new to prepare'those three part negatives from color sensitive lined plates in the way described, whereby it becomes possible to reproduce the original in the most deli.- cate half tones and perfectly true in the colors, because the part pictures can be accommodated very easily to the negatives that are to be copied.

Specification of Letters Patent.

application filed August 15, 1e13 erlal No. 785,847.

' for the 7 blue Pa en ed Feb- The invention is illustrated in the ae'come panymg drawings, in which:

Figure 1 isa plan View of a sheet of paper having the base layer associated therewith rint, the base layer being broken away; ig. 2 is a sectional view of Fig. 1.; Fig. '3 1s a plan view of the first partial picture (blue print) Fig. 4 is a sectional view of Fig. 3; Fig. 5 is a view of the combined first and secondypa rtial picture (blue and red print); and g. .6 is a'view of the whole print).

In the drawing, a represents a sheet of paper bearing the basic layer, b, to which latter is applied thereadily sensitive layer of fish glue, 0. j

cl represents the layer of collodion which is applied to layer ,0 subsequent to the drying of the copied and developed partial picture.

The process is carried out asfollows: For paper the best thing to use is an unsensitized baryta gelatin paper of any desired thickness.such as'is generally used in makin the ordinary silver bromid papers. Size drawing paper is not found tobe so suitable as it does not give nearly such fine glean tones with the deepest blue'and does not give quite pure whites. In the first place the back of the paper is coated or paintedwith 'a solution of 3% gelatin to whieh a small quantity of chreme alum has been added, so

ht ma e u t tlit illlstrtth bi l e i.

the all t P s e ent:- A-f er ihg f u dried', the paper is laidin a tray or saucer i h c Wa a d k p he e fer 'ebqet.

one minute until theglatin layeris th oughly softened. The paper is then laid p ce of p a e gl s 9 h ike d iir il: lightly with a noller on the coated sidejfor ose ofremoving any superfluous P c ur i e; d nd y lhw 1 water. he Wet sheets'are'then laid onfa f drawingibdeld fie ur ace which e n coveredwith Pape and hrefixed a four corners. The sheets have nowftobe coated oripainted with the sensitiiiiigsblii foo iQh hichmw b o of t e gene y".

now m xtu e th a s for th prussiate or blue process. paint brush may be used and it is preferably manipulated lengthwise and cross wise over the moist gelatin layer. V

The sensitizing solution may consist of: 1. '50 cubic cm. distilled Water; 4.5

Every soft full potassium ferricyanid. 2. 50 cubic cm. di'stilled water; 12.5 rams ammonium ferric citrate (green). 6f these solutions equal parts are taken and mixed together. About 25 cubic chi. will suffice for four sheets of paper 18 by 24 cm. large. The sheets after coating are dried as quickly as possible and then printed under the red filter negative until the darkest shadows appear a bright gray-blue. The print is then washed and dried. If the color is not intense enough,

the print can be dipped for a moment or two into a solution of ferric chlorid. The thoroughly dried prints are then laid for about 8-10 minutes in a tray with zapon-lac or other suitable substance, to render them perfectly impenetratable to water, and they are then dried again. Meanwhile two solutions are prepared for the subsequent coating of the" prints. One solution consists of 68 grams of American fish glue, such as is used in chemico-graphic laboratories which is dissolved in 100 grams water while the other solution consists of 6 grams of dry egg albumen which is dissolved in 75 grams of water also and after the albumen is properly dissolved 8 grams of ammonium bichromate are added. The two solutions are then mixed and finally 7.5 cubic cm. of a' 10% solution of chromic acid are added, and the whole is filtered repeatedly. This forms a stock solution which will keep for about fourteen days. A small quantity of the stock solution, about 100 cubic cm. is then taken and diluted with cubic cm. of water, to form a solution for immediate use. The prints are meanwhile secured to a small hand centrifugal apparatus and repeatedly washed with the last mentioned solution and then dried by means of the centrifugal apparatus over a small gas flame or spirit flame. The coating obtained in this way is very thin and uniform, and when properly dry the subsequent operations can be proceeded and thereafter placed in a tray containing the following yellow solution :2 grams aurophenin (such as can be obtained from the Farbwerke H6chst-on-theMain) dissolved in 100 cubic cm. hot distilled water. This solution is then made up to 1 liter with distilled water and 200 cubic cm. alcohol, 96% are added. The print is placed in this solution, being kept in constant movement, and allowed to remainbeing frequently examined and rinsed-until the yellow of the print has acquired the right shade and the green toopartly appears 1n the right shade. The print is then washed and well dried and 2% collodion poured over same. After the layer of collodion has dried, a second coating of the fish glue solution, above described, is given to the print, then it is placed under the green filter negative, exposed, washed and laid in the red bath, which consists of 10-12 cubic cm. of a 3% solution of erythrosin (which can be obtained from the Farbwerke H6chst-on-the-Main) dissolved in 100 cubic cm. Water. After sufiicient saturation,

.when the red color of the picture has appeared correctly the print is slightly washed and then put into a 5% solution of cupric sulfate for about two minutes, washed again and dried. The picture is then complete. It should be observed that the tinting with the coloring material is completed in a few minutes in each instance while the tinting of separate gelatin films such as has heretofore been done occupies from one to ten hours.

ll claim:

The herein-described process for obtaining rotographic prints in natural colors, whic consists in making three-part negatives from lined plates by employing subtractive color filters, printing from one of said negatives upon a surface coated with a solution used for the blue-printing process, applying a waterproof coating, applying a transparent sensitized coating, printing thereon from another of said negatives which is in registry with the first print, coloring the print with coloring matter corresponding to said other negative, applying a second waterproof coating, applying a second transparent sensitized coating, printing thereon from the third of said negatives which is in registry with the first and second prints, and coloring the print with coloring matter corresponding to said third negative.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JEAN GRUND, CARL Gnmvn. 

